Encrypt and ToDecrypt with DESCryptoServiceProvider

Encrypt and ToDecrypt with DESCryptoServiceProvider in C#
using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Security.Cryptography;

using System.Configuration;

using System.Web;

using System.IO;



namespace Common

{
    public class DESDecryption

    {

        private static string DES_Key = ConfigurationManager.AppSettings["DESKEY"];
        #region DESEnCode DES Encryption

        public static string DESEnCode(string pToEncrypt)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray = Encoding.GetEncoding("UTF-8").GetBytes(pToEncrypt);
            des.Key = ASCIIEncoding.ASCII.GetBytes(DES_Key);
            des.IV = ASCIIEncoding.ASCII.GetBytes(DES_Key);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())

            {
                ret.AppendFormat("{0:X2}", b);
            }
            ret.ToString();
            return ret.ToString();
        }

        #endregion

        #region DESDeCode DES Decryption
        private string DESDeCode(string pToDecrypt)

        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
            for (int x = 0; x < pToDecrypt.Length / 2; x++)
            {
                int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
                inputByteArray[x] = (byte)i;
            }
            des.Key = ASCIIEncoding.ASCII.GetBytes(DES_Key);
            des.IV = ASCIIEncoding.ASCII.GetBytes(DES_Key);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            StringBuilder ret = new StringBuilder();
            return System.Text.Encoding.UTF8.GetString(ms.ToArray());
        }

        #endregion



    }

}

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